65881120 has 96 divisors (see below), whose sum is σ = 168276528. Its totient is φ = 24281088.

The previous prime is 65881099. The next prime is 65881121. The reversal of 65881120 is 2118856.

It can be written as a sum of positive squares in 8 ways, for example, as 56370064 + 9511056 = 7508^2 + 3084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65881121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143932 + ... + 144388.

Almost surely, 2^65881120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65881120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84138264).

65881120 is an abundant number, since it is smaller than the sum of its proper divisors (102395408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65881120 is a wasteful number, since it uses less digits than its factorization.

65881120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 534 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 65881120 is about 8116.7185487733. The cubic root of 65881120 is about 403.8812185520.

Adding to 65881120 its reverse (2118856), we get a palindrome (67999976).

The spelling of 65881120 in words is "sixty-five million, eight hundred eighty-one thousand, one hundred twenty".